Publication details

Expansion of round gobies in a non-navigable river system

Authors

ŠLAPANSKÝ Luděk JANÁČ Michal ROCHE Kevin Francis MIKL Libor JURAJDA Pavel

Year of publication 2017
Type Article in Periodical
Magazine / Source Limnologica
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S0075951117300762
Doi http://dx.doi.org/10.1016/j.limno.2017.09.001
Keywords Impact; Invasive species; Neogobius melanostomus; Pioneer fish; Population characteristics; Proterorhinus semilunaris
Description A number of Ponto-Caspian Gobiid species have greatly increased their geographical ranges over recent decades. Most expansion studies to date, however, have focused on navigable waterways. In this study, we present a summary of six-years (2008-2013) monitoring of round goby Neogobius melanostomus expansion along two connected non-navigable rivers. Contiguous range expansion was observed in both rivers, with dispersal rate ranging from 1.2 to 3.2 km/year. Gobies at newly invaded sites ranged from 20 to 117 mm, with both juveniles and adult fish observed. Though the data did not allow us to see any consistent pattern in the first years after detection, there was some evidence for a shift to a female-biased, juvenile-dominated population over time. While the abundance of non-native tubenose goby Proterorhinus semilunaris appeared to be negatively influenced by round goby establishment, diversity of nearshore native fish showed no evidence of dramatic decline attributable to round goby.

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